Demi Louise O'brien, MD - Medicare Family Practice in Greenfield, IA

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Demi Louise O'brien, MD is a medicare enrolled "Family Medicine" physician in Greenfield, Iowa. She graduated from medical school in 2020 and has 5 years of diverse experience with area of expertise as Family Practice. She is a member of the group practice Greater Regional Medical Center and her current practice location is 288 Public Sq, Greenfield, Iowa. You can reach out to her office (for appointments etc.) via phone at (641) 743-6529.

Demi Louise O'brien is licensed to practice in Iowa (license number MD-50804) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1700409828.

Contact Information

Demi Louise O'brien, MD
288 Public Sq,
Greenfield, IA 50849-1264
(641) 743-6529
(641) 743-8223

Map and Direction




Physician's Profile

Full NameDemi Louise O'brien
GenderFemale
SpecialityFamily Practice
Experience5 Years
Location288 Public Sq, Greenfield, Iowa
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Demi Louise O'brien graduated from medical school in 2020
  NPI Data:
  • NPI Number: 1700409828
  • Provider Enumeration Date: 05/22/2020
  • Last Update Date: 02/17/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 3274919147
  • Enrollment ID: I20230525002027

Medical Identifiers

Medical identifiers for Demi Louise O'brien such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1700409828NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207Q00000XFamily Medicine MD-50804 (Iowa)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Greater Regional Medical CenterCreston, IAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Greater Regional Medical Center923404101334

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Demi Louise O'brien allows following entities to bill medicare on her behalf.
Entity NameIowa Physicians Clinic Medical Foundation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1366425274
PECOS PAC ID: 8729992318
Enrollment ID: O20031118000363
Entity NameGreater Regional Medical Center
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1902805062
PECOS PAC ID: 9234041013
Enrollment ID: O20040205000926

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Demi Louise O'brien is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Demi Louise O'brien, MD
288 Public Sq,
Greenfield, IA 50849-1264

Ph: (641) 743-6529		Demi Louise O'brien, MD
288 Public Sq,
Greenfield, IA 50849-1264

Ph: (641) 743-6529

Reviews and Comments


Family Medicine Doctors in Greenfield, IA

Dr. Timothy Piearson, D.O.
Family Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 609 Se Kent St, Greenfield, IA 50849
Phone: 641-743-6189    Fax: 641-743-6217

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.